[SOLVED] Bash prompt issues

Hi everyone and sorry for couldn't find a more descriptives title.Two issues here.

First.I'm looking for a way, even if it's possible, for to have Bash prompt on two rows.I mean not just the $PS1 but everything in the prompt.I try to be more clear with an example:

this/is/my/hypothetical/prompt/in/a/very/long/path : and this will be a very long, long, long command! What a long command man. I'm impressed how long is it :D and I don't know what to write anymore.

Watch at what happened in the above example. At the moment we reached the edge of the text area, text continues under the previous row, in a new one. In my Bash prompt, in the same situation, it'd continue on the same row, again, from left to right, covering the oldest row. How can I make it on more rows?

Second.Random in the Bash prompt, even if I run clear, piece of the previous inserted command remains, but in such cases it won't be consider as command from Bash.Example:

/path/where/im/in : long command in the prompt which leaves its trace
[...]
/path/where/im/in : clear
/path/where/im/in : long command[b]new command[/b]
^^^^^^^^^
[i]This part shouldn't be there but it don't disappears.[/i]